[Coco] [Color Computer] Re: VHDL 6809

[jdaggett at gate.net]

James

A while back someone started work on a MC6845 FPGA in VHDL.. 
The project never was completed as far as I know.

As for Jeff Kent's design it incoporates several other sections that 
some may find usefull. I am not so keen on the idea of putting the 
boot code in the FPGA but that is what he has done. I have not 
done any timing analysis on his latest release but I did on one early 
version and found that the speed improvement was not that great 
over a standard part. SInce he uses a single phase clock internally, 
the fastest the clock will run is around 10 Mhz. 

One other drawback for use in a Coco is that it will require a 300K 
gate FPGA, Xilinx Spartan IIE at about $38.00 single unit price. 

james




On 11 Feb 2004 at 19:03, James Diffendaffer wrote:

To:             	ColorComputer at yahoogroups.com
From:           	"James Diffendaffer" 
<jdiffendaffer at yahoo.com>
Date sent:      	Wed, 11 Feb 2004 19:03:21 -0000
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VHDL 6809
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> --- In ColorComputer at yahoogroups.com, "John" <John0457 at h...> wrote: >
> Hi, > > I just joined the group. > I was wondering if anyone knew of
> any one implementing a CoCo > in an FPGA. I have a 6809 VHDL core
> running the Flex operating system. >
> http://members.optushome.com.au/jekent/FPGA.htm
> 
> Several people have talked about it but I don't know if any are
> working on it.  I considered it but the VDG would be kinda time
> consuming. If there were a 6847 clone in VHDL it would be easy.
> 
> 
> 
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